2 + 4 x 1000000000000000000000000000000000000000000000

That's a lot of 0s. It's much faster to use scientific notation for it:

2 + 4 * 10⁴⁵

Now we have a dilemma. There are two ways of reading this.

I think it's likely you meant this:

(2 + 4) * 10⁴⁵ = 6.0 * 10⁴⁵

But in the standard order of mathmatics, you would have this:

2 + (4 * 10⁴⁵) = 4[fourty four 0's...]2